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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

You can't. If you rely on a dynamic IP here, you have to make sure that the IP time outs very fast (verify your TTL), which restricts the underlying name resolving library in glibc to reload the IP address.

So, there is no way to give access to my proxy server to an outside client who has a dynamically changing IP and just writing down his DNS name which is one of "no-ip.org " to my access list in squid.conf file. Any suggestions for a workaround.